Greddy EGT kit vs. Greddy A/F kit

[RedlineRacer]

Which one do you think is better for tuning? The EGT is almost half the cost of the A/F. They both are very accurate right?

[sxse240]

I'm facing the same decision right now. My first choice is air/fuel, but most guys I've talked to around here prefer EGT.

Their common complaint is that the AFR gauge "jumps around" too much, thus they don't think it's very useful. While it does jump around as you drive, under full throttle it's pretty steady and works like expected. Most of these guys use their EGT as more of a warning gauge (i.e. "Your EGTs are 1400 degrees, meltdown is imminent").

Most of the same guys also said they'd go with AFR if they used a wideband sensor, which are cheap now. I may skip both, ballpark the driveway tune and keep it out of boost on the way to the dyno to tune.

Anybody else have some answers?

[uiuc240]

Are you using a stock MAFS and ECU and injectors? If so, you have almost zero adjustability and the A/F and EGT are basically worthless additions.

Otherwise...you need both. A wideband O2 sensor for proper A/F readings and an EGT for seeing if you're really running that lean or rich. The best is a nice wideband O2 though.

Eric

[steve shadows]

:eek2: nooooooooooooooo everyone just stop and calm down haha, you need both a wideband 02 sensor and a egt as well as preferably a knock sensor (like reading the hand commander knock display on power fc) with these three things you can accurately tuned you engine.

With a properly setup wideband 02 sensor you should be straight (if you had to pick one out of the bunch) then get a egt to cross check you exaust temps in the manifold or RIGHT after or in the turbine housing (which is how i have mine setup).

What i do is log the egts (greddy) and the wideband readings and cross check them then tune accordingly then when the wideband isnt hooked up i set the warning on the egt gauge for a little over the highest temp seen with my tuned afrs. THen if for some reason the car runs lean or the fuel pump starts to go out the warning buzzer and light from the egt gauge will let me know.

tuned a cars afr with egt is hard because both runing very rich and very lean will cause high exaust gas temp readings. Also if you want to tune with the egt it is reccomened to have it located in the collector of the manifold and 950-1050 C is hot on sr, after the collector or in the turbine housing as i have mine is around 850C is hot for sr or unsafe.

Wideband tuning is first, then cross checking with egt, then knock meter for pushing the limits!

btw i do tuning for cheap , street tune, let me know in socal

-steve

[93rps13]

theres a wideband for sale at www.lsauto.com for like under 400 i think check it out, sorry if i am hi-jacking but does anyone know what a good af ratio, i heard 11.8:1 but wat do you people think?

[steve shadows]

theres a wideband for sale at www.lsauto.com for like under 400 i think check it out, sorry if i am hi-jacking but does anyone know what a good af ratio, i heard 11.8:1 but wat do you people think?


the ghetto(ls) auto wideband is a freakin joke, innovate-motorsports makes the best wideband for the money or about 350 bucks, with software for datalogin and for another 100 bucks you can have 6 additional inputs graphed in real time record and then displayed on you laptop in the car as you tune very very accurate and specific readouts.

I have one i wouldnt trade it for anything.

In terms of afr i think it depends on the amount of boost, the type or engine, the type of turbo, the type of fuel, there are many different deciding factors for engines and tuning. generally for 91 octane with say a t28 or a small t3/t4 a 11.8-12.0 ratio is ok, depending on the exst temp and knock sensor readout. For race gas i normally run a 12.80-13.0 ratio and for pump gas i run a 11.5-11.9 ratio with a big 62-1 compressor/t3 hybrid.

-steve :nono:

[93rps13]

In terms of afr i think it depends on the amount of boost, the type or engine, the type of turbo, the type of fuel, there are many different deciding factors for engines and tuning. generally for 91 octane with say a t28 or a small t3/t4 a 11.8-12.0 ratio is ok, depending on the exst temp and knock sensor readout. For race gas i normally run a 12.80-13.0 ratio and for pump gas i run a 11.5-11.9 ratio with a big 62-1 compressor/t3 hybrid.

-steve :nono:[/QUOTE]

do they have a website?

silver top RB20DET with 248 intake and exhaust cams, a T3/TO4E trim spec .50 a/r compressor .63 a/r turbine on 91 or 93

thanks

EDIT: with is running with e manage and i hope 555cc injectors

[RedlineRacer]

both of these kits come with wideband o2 sensors and computers. Its not just some dinky gauge like the autometer a/f gauge. I will be running a hacked MAFS, 370cc injectors, and a AFC. I am just trying to decide if I should spend $325 on the greddy A/F kit or $250 on the greddy EGT kit. I can probably get a Bosch wideband for free, seeing as how I work at a Bosch plant.